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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
365/x = 56.87 // - 56.87
365/x-56.87 = 0
365*x^-1 = 56.87 // : 365
x^-1 = 0.15580822
-1 < 0
1/(x^1) = 0.15580822 // * x^1
1 = 0.15580822*x^1 // : 0.15580822
6.41814662 = x^1
x = 6.41814662
x = 6.41814662
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